FAQ

  • What valve length do I need?

    The standard milKit valves have a usable length of 35 mm (1 3/8 inch), and they work for most rims except some special high-profile rims. For high-profile rims, there are 55mm and 75mm versions of the milKit valves.
    Click here to see the valve dimensions.
  • What tire and rim sizes do milKit work with?

    milKit works with all common tire and rim sizes and widths, including 26", 650B, or 29", and road, mountain, or city bike wheels.
    The standard milKit valves have a usable length of 35 mm (1 3/8 inch), and they work for most rims except some special high-profile rims. For high profile rims, there are 55mm and 75mm versions of the milKit valves.
    Click here to see the valve dimensions.
  • How much air pressure can I have in my tire while measuring or refilling sealant in the tire?

    It is best if you reduce the air pressure to 1-1.5 bar 14-22 psi before measuring and refilling. This is enough to keep the tire in place. It is also possible to measure and refill at higher pressures.
  • Which sealants can be used with milKit?

    milKit can be used with most common sealants. Some sealants have very large particles and cannot be filled into the tire through the valve. The large particles of these sealants clog the valves while riding more than the other sealants. We recommend using milKit valves to prevent your valves getting clogged by the sealant.

    Sealants that work fully with milKit:
    • Conti Revo Sealant
    • Bontrager TLR
    • Effetto Mariposa
    • Hutchinson Protect’Air
    • Joe’s No Flats super and road racing sealant
    • Mavic tire sealant
    • OKO Magic sealant
    • Orange Seal
    • Schwalbe Doc Blue
    • Stan’s No Tubes
    • Slime STR sealant
    • WTB TCS sealant
    • Most other sealants
    Sealants with large particles that won’t go through the syringe::
    • E13 tire plasma
    • Joe’s No Flats eco and race sealant
    • Stan’s No Tubes Race sealant
  • When do I have to replace my sealant?

    There are two reasons why you should regularly check your sealant::
    1. Sealant drying up
    2. Sealant getting old
    You should always have the amount recommended by the sealant manufacturer in your tire. You will develop a feeling, over time, of how frequently you have to check your sealant. Its always good check your sealant before a long ride or a holiday to have the peace of mind that your tubeless system will be all right.

    Sealants also get old and lose their functionality. Old sealant can be recognized by a change of color or when it starts dissolving and the consistency is more like water than like new sealant. Old sealant should be extracted from the tire with the syringe and disposed of, as mixing the new with the old sealant is not recommended.
  • Can I use milKit with valves from other brands?

    Our valves are custom made, as they have closed rubber flaps at the bottom. This has several advantages::
    • The valves don’t get clogged anymore
    • They keep the air inside, even if you remove the valve core (easier installation of tubeless tires)
    • They allow measuring and refilling with the air pressure still in the tire
    You can use valves from other brands, but you would not benefit from the best advantages milKit offers.
  • How can I prevent the plunger from getting ejected from the syringe?

    It is very important that you close the sealant regulator before you insert the needle into the valve.

    Then, make sure you open the sealant regulator slowly, and let the sealant flow into the syringe. Be ready to close the sealant regulator once all sealant is in the syringe (you can hear, see, and feel the air bubbles coming through the needle). The plunger moves a lot faster if no sealant is in the tire and only air is flowing into the syringe.
  • How do I let air out of the tire if the valves are closed at the bottom?

    The milKit valve core has an additional valve core extension that pushes open the rubber flaps at the bottom of the valve, if you want to release air from the tire. Releasing air during your ride is as easy as it was before.
  • Can I use milKit on my road bike?

    The milKit valve system can be used in mountain, road, and city bikes. We recommend using tubeless ready tires and rims for optimal performance and reliability.